feat: make preconditioning failure available (in API)

The preconditioning element has an interesting field called
"failureCause" which reports error conditions like opened doors, battery
low state etc preventing the preconditioning to run. These errors are
interesting, so make them available in our API.

This field was removed in 619cefd4, not sure why, so add it again.

Fixes #760.

psa_car_controller/psa/connected_car_api/models/preconditioning_air_conditioning.py

@@ -31,18 +31,20 @@ class PreconditioningAirConditioning(object):
                             and the value is json key in definition.
     """
     swagger_types = {
+        'failure_cause': 'str',
         'status': 'str',
         'updated_at': 'datetime',
         'created_at': 'datetime'
     }
 
     attribute_map = {
+        'failure_cause': 'failureCause',
         'status': 'status',
         'updated_at': 'updatedAt',
         'created_at': 'createdAt',
     }
 
-    def __init__(self, status=None, updated_at=None, created_at=None):  # noqa: E501
+    def __init__(self, failure_cause=None, status=None, updated_at=None, created_at=None):  # noqa: E501
         """PreconditioningAirConditioning - a model defined in Swagger"""  # noqa: E501
 
         self._failure_cause = None
@@ -51,6 +53,8 @@ class PreconditioningAirConditioning(object):
         self._updated_at = None
         self.discriminator = None
 
+        if failure_cause is not None:
+            self.failure_cause = failure_cause
         if status is not None:
             self.status = status
         if updated_at is not None: